A new book reveals an unusually personal–and apparently awkward–moment during the first encounter between First Lady Michelle Obama and France's First Lady, Carla Bruni.

The book's author, Newsweek editor Jonathan Alter, writes that Bruni, "delighted in telling friends that she shocked Michelle Obama at their first meeting."

Alter describes the meeting between the first ladies in which Bruni boasted that she and French President Nicolas Sarkozy, "once kept another foreign leader waiting while they finished having sex."